package containers;

import java.util.Map;

public class MapEntry<K,V> implements Map.Entry<K,V> {
    private K key;
    private V value;
    public MapEntry(K key,V value){
        this.key = key;
        this.value = value;
    }

    @Override
    public K getKey() {
        return key;
    }

    @Override
    public V getValue() {
        return value;
    }

    @Override
    public V setValue(V value) {
        V result = this.value;
        this.value = value;
        return result;
    }

    @Override
    public int hashCode() {
        return (key == null ? 0 : key.hashCode()) ^ (value==null ? 0:value.hashCode());
    }

    @Override
    public boolean equals(Object obj) {
        if (!(obj instanceof MapEntry)) return false;
        MapEntry me = (MapEntry)obj;
        return
                (key == null ?
                        me.getKey() == null : key.equals(me.getKey())) &&
                        (value == null ?
                                me.getValue() == null:value.equals(me.getValue()));
    }

    @Override
    public String toString() {
        return key + " = " + value;
    }
}
